Terahertz flexible waveguides: an overview

Recent technological advances in the terahertz (THz) region of the electromagnetic spectrum, located midway between microwaves and optical waves, have made possible the development of THz systems for applications such as spectroscopy, sensing, imaging, and communications. The availability of low-loss flexible waveguides for THz waves would represent a key step towards innovative systems and would open the way to novel applications. This paper attempts to give an overview of the experimental and theoretical investigations in this area, from the early parallel-plate metal waveguides to the present photonic crystal fibers.

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